final MasterReport report = new MasterReport();
final CrosstabElement element = new CrosstabElement();
report.getReportHeader().addElement(element);
final TestReportDesignerContext rdc = new TestReportDesignerContext();
rdc.addMasterReport(report);
rdc.addSubReport((ReportDocumentContext) rdc.getDocumentContext(0), element);
rdc.setActiveDocument(rdc.getDocumentContext(1));
final ReportDocumentContext activeContext = rdc.getActiveContext();
Assert.assertNotNull(activeContext);
Assert.assertEquals(activeContext.getReportDefinition(), element);